package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.LOGIN_USER_KEY;

public class RefreshTokenInterceptor implements HandlerInterceptor {
    private StringRedisTemplate stringRedisTemplate;
    // 由于登录拦截器是手动创建的对象 不是spring容器创建的 需要手动注入
    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 获取请求头当中的token
        String token = request.getHeader("authorization");
        if (StrUtil.isBlankIfStr(token)) {
            return true;
        }
        // 从redis 当中获取用户
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash().entries(LOGIN_USER_KEY + token);
        // 判断用户是否存在
        if(userMap.isEmpty()){
            return true;
        }
        //将查询到的hashmap转为dto对象
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);
        // 存在 保存用户信息到threadlocal
        UserHolder.saveUser(userDTO);
        //  刷新token有效期
        stringRedisTemplate.expire(LOGIN_USER_KEY+token,RedisConstants.LOGIN_USER_TTL, TimeUnit.MINUTES);
        // 放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        // 移除用户数据
        UserHolder.removeUser();

    }
}
